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gerrit.openbmc.org / openbmc / x86-power-control / edc86f3524e9e6fe7bdd64a88886be003e24090b
commitedc86f3524e9e6fe7bdd64a88886be003e24090b[log] [tgz]
authorZev Weiss <zev@bewilderbeest.net>Tue May 07 01:44:33 2024 +0000
committerZev Weiss <zev@bewilderbeest.net>Fri May 10 23:57:08 2024 +0000
tree266b3d174a4bfb7b2366e2a69e644432d91686cf
parent58232256fdd892e0a6193c5dd3a0dc5aab2b6477 [diff]
Respect polarity config on input signals

Previously the polarity setting was (in all but one case) only being
used in setting outputs driven by the daemon.  With this change we also
take it into account in determining whether input signals are asserted
or deasserted.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: Ifd326e9c64de144dc45d217be5212329a5f3d242
1 file changed
tree: 266b3d174a4bfb7b2366e2a69e644432d91686cf
  1. config/
  2. service_files/
  3. src/
  4. subprojects/
  5. .clang-format
  6. .gitignore
  7. LICENSE
  8. meson.build
  9. meson.options
  10. OWNERS
  11. README.md
README.md

X86 power control

This repository contains an OpenBMC compliant implementation of power control for x86 servers. It relies on a number of features to do its job. It has several intentional design goals.

  1. The BMC should maintain the Host state machine internally, and be able to track state changes.
  2. The implementation should either give the requested power control result, or should log an error on the failure it detected.
  3. The BMC should support all the common operations, hard power on/off/cycle, soft power on/off/cycle.

This daemon has been successfully used on a variety of server platforms; it should be able to support platforms with power control GPIOs similar to those in its config file.

x86-power-control uses default json file (power-config-host0.json) for GPIO configuration. However this can be customized by producing your own power-config-host0.json file.

Signal Definitions

Definitions can be configured by two type: GPIO and DBUS

GPIO

For the platform having direct GPIO access can use the type GPIO and define like below.

{
  "Name": "PostComplete",
  "LineName": "POST_COMPLETE",
  "Type": "GPIO"
}

DBUS

For the platform not having direct GPIO access can use dbus based event monitor by using the type DBUS.

{
  "Name": "PowerButton",
  "DbusName": "xyz.openbmc_project.Chassis.Event",
  "Path": "/xyz/openbmc_project/Chassis/Event",
  "Interface": "xyz.openbmc_project.Chassis.Event",
  "Property": "PowerButton_Host1",
  "Type": "DBUS"
}

x86-power-control will monitor the property change from the given DbusName and take appropriate action. *define Property as a bool variable.

Caveats: This implementation does not currently implement the common targets that other implementations do. There were several attempts to, but all ended in timing issues and boot inconsistencies during stress operations.

Build Options

chassis-system-reset

Enable chassis system power reset to allow removing power and restoring back.

use-plt-rst

The POST Complete GPIO is usually held asserted by BIOS after POST complete and de-asserts on reset. This de-assert behavior is currently used to detect warm resets.

Some systems are adding support for a PLT_RST eSPI signal that can be used to more accurately detect warm resets. When this option is enabled, x86-power-control will use PLT_RST to detect warm resets instead of POST Complete.

See https://github.com/Intel-BMC/host-misc-comm-manager for implementation example.